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參數資料
| 型號： | PCM1719 |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 立體聲音頻數字模擬轉換器 |
| 文件頁數： | 7/15頁 |
| 文件大小： | 218K |
| 代理商： | PCM1719 |
7
PCM1719
SYSTEM CLOCK
The system clock of PCM1719 must be either 256f
S
or
384f
S
, where f
S
is the audio sampling frequency, such as
32kHz, 44.1kHz, and 48kHz. The system clock is used to
operate the digital filter and the multi-level delta-sigma
modulator. The system clock can be either a crystal oscilla-
tor placed across XTI (pin 1) and XTO (pin28), or an
external clock input to the XTI pin directly. In this case, the
XTO pin should be open (floating). Figure 1 illustrates the
internal clock circuit and typical connection.
The PCM1719 has a system clock detection circuit which
automatically detects the system clock of either 256f
S
or
384f
S
. The system clock should be synchronized with the
LRCIN (pin 4) clock (sampling frequency), but the PCM1719
allows for a phase difference between LRCIN and the
system clock. If the phase difference between LRCIN and
system clock is larger than
±
6 bit clocks (BCKIN), the
synchronization of the system clock and LRCIN is done
automatically. The analog outputs are forced to V
CC
/2 dur-
ing the syunchronization operation. Table I shows the sys-
tem clock frequency input to the PCM1719.
SAMPLING RATE
FREQUENCY (LRCIN)
SYSTEM CLOCK
FREQUENCY (MHz)
256f
S
384f
S
32kHz
8.1920
12.2880
44.1kHz
11.2896
16.9340
48kHz
12.2880
18.4320
TABLE I. System Clock Frequencies vs Sampling Rate.
INFINITE ZERO FLAG FUNCTION
When the audio input data (at both channels) is continuously
zero (BPZ code) for 65, 536 cycles of bit clock (BCKIN),
ZERO (pin 7) goes to a “LOW” level. When the audio input
data is non-zero, the ZERO pin goes to a high-impedance
state immediately. This pin is open-drain.
FIGURE 1. Internal Clock Circuit Diagram and Oscillator Connection.
C
1
C
2
C
1
, C
2
= 10 to 20pF
Internal System Clock
XTI
X’tal
XTO
PCM1719
CLKO
External Clock
Internal System Clock
XTI
XTO
PCM1719
EXTERNAL CLOCK INPUT
XTO pin =Floating
CRYSTAL OSCILLATOR CONNECTION
CLKO
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM1719E | 功能描述:音頻數/模轉換器 IC Lo-Pwr Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM1719E/2K | 功能描述:數模轉換器- DAC SoundPlus(TM) Stereo Audio DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| PCM1719E/2KG4 | 功能描述:數模轉換器- DAC SoundPlus(TM) Stereo Audio DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| PCM1719EG4 | 功能描述:音頻數/模轉換器 IC SoundPlus(TM) Stereo Audio DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM-172 | 功能描述:電線鑒定 Pre-Printed WM Card, Vinyl Cloth, .22" W RoHS:否 制造商:TE Connectivity / Q-Cees 產品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長度:1 in |
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